From: Wei Chen <harperchen1110@xxxxxxxxx> [ Upstream commit 44a3b36b42acfc433aaaf526191dd12fbb919fdb ] var->pixclock can be assigned to zero by user. Without proper check, divide by zero would occur when invoking macro PICOS2KHZ in au1200fb_fb_check_var. Error out if var->pixclock is zero. Signed-off-by: Wei Chen <harperchen1110@xxxxxxxxx> Signed-off-by: Helge Deller <deller@xxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/video/fbdev/au1200fb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c index 6c542d0ca076e..e17a083f849ad 100644 --- a/drivers/video/fbdev/au1200fb.c +++ b/drivers/video/fbdev/au1200fb.c @@ -1039,6 +1039,9 @@ static int au1200fb_fb_check_var(struct fb_var_screeninfo *var, u32 pixclock; int screen_size, plane; + if (!var->pixclock) + return -EINVAL; + plane = fbdev->plane; /* Make sure that the mode respect all LCD controller and -- 2.39.2
